Quartz-mill



J-. G. DAVIS. QUARTZ MILL.

No. 29,470. Patented Aug. 7, 1860.

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JOB C. DAVIS, OF SAN FRANCISCO, CALIFORNIA.

QUARTZ-MILL.

Specification of Letters Patent No. 29,470, dated August 7, 1860.

T 0 all whom it may concern:

Be it known that I, Joe C. DAVIS, of the city and county of San Francisco and State of California, have invented a new and useful Apparatus for Grinding or Pulverizing Metallic Ores or Tailings, which I call Daviss Quartz-Mill; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1, represents a vertical section of the apparatus; Fig. 2, is a cross section, showing the bed plate; Fig. 3, is a spiderframe; Fig. 4, is the face of one of the grinders Fig. 5, is a side view of one of the grinders.

A, is an annular trough, similar to that of a common arastra.

B, B, is a frame to support the shafting.

C, is a circular plate of iron or stone, slightly raised above the bottom of the trough.

D, is a spidenframe, the arms of which are perforated with holes at graduated distances from its center so that said holes in which the grinders E, E, are fastened by means of their rods or shanks, form a spiral line or parallel spiral lines, as represented in Fig. 3.

E, E, are grinders of iron or stone, and are fastened to the under side of the spiderframe by rods passing through the holes above mentioned.

F, is a shaft passing through both spiderframe and bed plate G, the lower end resting on an adjustable bearer K, which bearer passes through the brid e G, and is kept in its proper place by the Iever I.

H, is a small annular hopper, and revolves with the spider-frame, from this hopper a pipe or pipes lead directly in front of one or more of the arms of the spider frame.

111 ode 0; operation.The apparatus being set in motion the crushed ore or tailings, are allowed to run into the hopper H, thence by the pipe or pipes to the bed-plate C, imme diately in front of the first or innermost set of grinders, the grinders being rounded on their front edge (as shown in Fig. 5) pass easily on the crushed ore, or tailings, without throwing it suddenly from them, and being placed at an angle with the radii of the spiderfran1e, the tendency is to slowly throw the ore or tailings toward the trough A; the first set of grinders having passed over the quartz, the second set placed a little farther from the center takes their place, and so on, until the ore or tailings have been subjected to the action of all the grinders.

This method of grinding ores allows of a much greater speed, than is practicable in any other mode of working ores, and is one of its greatest advantages over other methods.

The spider may be divided into any required number of arms, and the grinders into as many sets as desired.

Having described my invention, what I claim therein as new, and desire to secure by Letters Patent, is

Arranging a series of grinders E so as to form a spiral line or spiral lines around the center shaft, constructed in the manner and for the purposes set forth.

JOB C. DAVIS. WVitnesses:

CHAS. R. BOND,

F. I. THIBAULT. 

